Paper-bag machine.



PATENTED SEPT. 26, 1905'.

P. B. STRASBURG.

PAPER BAG MACHINE. APPLICATION FILED FEB.26,1904.

6 SHEETS-SHEET 1.

fl/z'inesses N0.800,337. PATENTED SEPT. 26, 1905. P. E. STRASBURG. I

PAPER BAG MACHINE.

APPLICATION FILED $113.26, 1904.

6 SHBETSSHEET 2.

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' m1; filqy No- 800,337. v PATENTED SEPT. 26, 1905 P. E. STRASBURG.

PAPER BAG MACHINE.

APPLICATION FILED FEB, 26,1904,

6 SHEETS-SHEET 3.

Min/asses N0- 80 0,337. PATENTED SEPT. 26, 1905.

PAPER BAG MACHINE.

' APPLICATION FILED 2313.26, 1904.

Q sums-sum 4.

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7 I PATBNTED 12126, 1905; P, E. STRASBURG. PAPER BAG MACHINE. APPLICATIOK FILED 1'33. 26, 1904.

6 SHEETS-$33111 5.

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'No. 80 0,337. PATENTED-SEPT.26,1905.

F.E.STRASBURG.

PAPER BAG MACHINE.

APIPLIOATION FILED FEB.26,1904.

' e sums-sum 6.

In vanar:

- UNITED STATES PATENT, OFFICE.

FREDERICK E. STRASBURG, OF RUMFORD FALLS, MAINE, ASSIGNOR TO CONTINENTAL PAPER BAG COMPANY, A CORPORATION OF MAINE.

PAPER-BAG MACHINE.-

Specification of Letters Patent.

Patented. Sept. 26, 1905.

Application filed 'Iebruary 26, 1904:. Serial No. 195,339-

To all whom it may concern..-

Be it known that I, FREDERICK E. STRAS- BURG, a citizen of the United States, residing at Rumford Falls, in the county of Oxford and State of Maine, have invented certain new and useful Improvements in Paper-Bag Machines, of which the following is a specification.

This improvement relates to paper-bag ina tubes is by means of a striker having a path'of movement across the path of travel of the bagtube. In operating paper-bag machines, particularly at high speeds, it has been found conducive to uniformity of-product to slacken the bag-tube more or less at the time of the operation of the striker.

One of the objects of my-improvementis to furnish reliable means for thus slacking the tucked-paper tube prior to severing a bagblank therefrom. v

Another object of my improvement is to furnish simple, reliable, and rapid means for opening out the forward end of a paper tube having an inwardly-folded tuck" in each side thereof and folding it down into the diamond form. The formation of the tucked-paper tube may be by any of the well-known mechanisms therefor, and the later operations of folding and pasting the flaps of the diamond may be performed by any suitable means.

My invention is partially in the nature of an improvement on the invention disclosed in United States Patent No. 598,497, granted February 8, 1898,'to Edward E. Glaussen, and to which reference may be had.

My improvement comprises means, first,for

thereof.

Another feature of my improvement comprises means for operating the side clips as to the tucker-plate, and 'a further feature cornprises means for preventing tearing of the bagblank adj acent to the front flap of the diamond, where tearing is peculiarly liable to occur in .this type of bag at the time of the opening out of the tucked tube prior to the formation of the diamond.

In the drawings accompanying this specification, Figure 1 is aside elevation of a portion of a paper-bag machine, illustrating one form and which may be the preferred form of my improvements. Fig. 2 is a side elevation, partly in section'and on an enlarged scale, representing more'in detail the slacking and creasing mechanism. Fig. 3. is a plan view looking in the directlon lndlcated by the arrow in Fig. 20f the slacker and creaser rolls.

Fig. L is a side elevation. with parts broken away, of the diamond-folding mechanism similar to a portion of Fig. 1, but showing the parts in different relative positions. Fig. 5 is a side elevation, partly in section, similar to a portion of, Fig.4, but on an enlarged Fig. 6 is a side elevation similar to scale. Fig. 4, but of the opposite 'side of the machine. scale, showing more in detail parts of the enlarged side elevations showing more in detail successive positions of portions of the diamond-folding mechanism. Fig. 10 is a plan View on the supplemental front-finger mech- ;anism. Fig. 11 is a cross-section on line a a; in Firih'ii. Fig. 12 is a diagrammatic view illustrating'the operation of 'theslacking mechanism; Fig. 13 is a perspective view showing the operation of the guard-finger.- Figs. 14 and 15 illustrate modifications in .mountingthe slacker-bars of my improvedv machine.

The general type of machine to which in .the present instance I have chosen to showmy improvements applied may comprise side. frames, as 3, in which may be supported the' various submechanisms and parts of the, paper-bag machine. Power may be commuinicated by some suitable means (not shown) to the carrier-gear 6. From this gear power may be conveyed through the train of gears 47, 48, 49, and to gears 51 5a, fixed-jtothe. shafts 51 52, respectively, on which are; se-- cured feed-rolls 16 16, respectively, and. toj.j

gears 53 54:, fixed to the shafts 4:2 32, respec- ,tively, on which are secured feed-rolls 1,9 20

re pectively; Saidi of gears .5 P

Fig. 7 is .a plan view, on an enlarged 8o tucker-plate mechanism. Figs. 8 and 9 are portioned and arranged as to drive said two pairs of rolls at equal peripheral speed and in the directions indicated by their relative arrows, respectively. The length of the bagblanks is predetermined by the relative sizes of the gears in said train.

Power is communicated from gear 54 to gear 56, fixed on shaft 55, to which shaft is secured cam 58, through intermediate gear 57. Gears 51and 56 are ofequal size, whereby cam 58 is rotated through one complete revolution for each complete revolution of gear 54 and roll 20. The circumference of rolls 19 and 20 are each equal to the length of a bag-blank.

Rolls 16 16 are provided to feed the tuckedpaper tubing from the forming mechanism (not'shown) and deliver it to the severing mechanism, which in this instance comprises a serrated knife 18, float 180, and striker 17. The details of and the means for operating said severing mechanism may be of any suitable form-such, for instance, as those shown in the United States patent to Claussen, No. 726,866 of May 5, 1903. Above and subsequent to the striker are rolls 19 20, which receive the bag-tube from rolls 16 and by means of my improved slacker hold it during the operation of the striker and later deliver the severed bag-blank to one of the folding-beds 4. Upper roll 20 is mounted in adjustable boxes 61, which by means of setscrews 62 may be operated to vary the relation of rolls 19 20 to one another, and thereby vary the tension on the bag-blanks as they pass between said rolls. Said folding-beds 4 are shown in the present instance as three in number and are pivotally mounted for vibration on shafts 7, respectively, in rotary carrier 2, axially mounted upon shaft 5 in side frames 3. A power-shaft, (not shown,) connected by gearing to gear 6 of carrier 2, may impart rotary motion to said carrier and to folding-beds 1 thereon. Said folding-beds may be caused to oscillate on their respective pivots inwardly and outwardly as to axis 5 during their rotation about said axis on carrier 2. Extending from the under side of each folding-bed and toward axis 5 is arm 128, pivotally mounted on the inner end of which is roll 129 for engagement with still cam 150. By these means said folding-beds may be swung outwardly in succession at proper times and by means of pull-strings 1 18, one end of each of which is attached to the under side of its respective folding-bed and the other end to carrier 2, said rolls may be constrained to engagement with cam 150 and folding-beds 4: swung inwardly at proper times as allowed by said cam. Each of said folding-beds is provided at its pivot end with a front clip 26, preferably bifurcated, Fig. 10, and disposed and adapted to engage the forward end of the lower ply of the bag-blank and clamp it to the foldingbed when such blank is delivered into suitable position onto the folding-bed. Said front clips may be opened by means of the engagement of roll 10 on arm 8, lixed to pivot-shaft 7, with which front clip 26 isrigid, with still cam 11. Said front clips may be closed when allowed by cam 11 by means of pull-spril'igs, as 1&9, one end of each of which is attached to arm 8 of its respective front clip and the other end is attached to carrier 2. Each of said folding-beds is also provided with the usual pivotally-mountcd side clips 63 631), which may be operated by any suitable means, such as by the engagement of rolls 9? 970, respectively, with cams not shown in the present drawings, but which, with their coacting springs, are fully set forth in United States Patent No. 635,090, granted October 17, 1899, to Claussen and Mortson, and to which reference may be had.

Secured to shaft 12, mounted for vibration in fixed bearings 68, secured to side frames 3, respectively, is a tucker-plate 13, provided with side clips 14 (Set and front hook 15. Said tucker-plate may be caused to vibrate through a predetermined stroke by means of cam 21, arm 22, connected by shaft 25 to gear-segment 23, and pinion 24. Said cam 21 is fast to the upper end of shaft 121, which shaft is mounted for revolution in bracket 125, projecting outwardly from side frame 3. On the lower end of said shaft 124 is spiral gear 126, meshing with spiral gear 122 on shaft 10. The gears are so proportioned as to cause cam 21 to make one revolution for each cycle of the machine.

Referring now more particularly to feed rolls 19 20, Figs. 2, 3, and 11, these rolls have in one side of each and extending throughout the length thereof a groove 27 as to roll 20 and 67 as to roll 19. \Vithin this groove in roll 20 and supported on arms 28 at opposite ends of said roll is a vibratory slacker-bar 29. Arms 28 are pivotally supported on opposite ends of shaft 30 and afiixed thereto by pins 31. Said shaft extends through said roll at one side and exterior of axial shaft 32 and diametrically opposite slacker-bar 29. Arms 28 are perforated by holes through which shaft 32 passes, and which holes are sufiiciently large to allow free action of said arms. By means of springs 3 1, one end of each of which ongages with each of arms 28, respectively, and the other ends of which engage with collars 35, respectively, arms 28 tend to impel bar 29 against side 36 of groove 27. The tension of springs 34: may be varied at will by means of adjustable collars 35, which collars may be secured to shaft 32 by set-screws 37. The vibratory stroke of bar 29, and therefore the amount of slack permitted the bag-tube, may be limited and adjusted by means of set-screw 38, threaded into wall 95 of roll 20, the point of which set-screw is arranged for engagement with bar 29 when said bar is retracted from its position of rest-as shown, for instance, in Fig.2. Set-screws 38 may be secured in any predetermined position by means of locknut 39.

Slacker-bar 4:0 in roll- 19 is supported on arms 41, which trunnion on shaft 43 and tend to impel bar against side 46 of "groove 67 by means of springs 4.4:, held under tension by collars 45, all substantially the same as similar parts as to roll 19, except in two respects: First, the various parts are arranged in opposite positions on the opposite rolls, and, sec- 0nd, vibratory bar 29 is furnished with a creaser'blade '59, whereas vibratory bar 40 is provided with a creaser-g'roove 60. Said creaser-blade 59 extendsthroughout the length of bar 29, projecting slightly from the face thereof, and is adapted to engage creasergroove 60, extending throughout the length of bar 40. Rolls 19 20 each make one complete revolution for each bag-blank (their circumference being each equal to the length of a bag-blank) and are so timed that the creaser blade and groove in bars 29 and 40, respec-' tively, will engage the bag-blank to form a crease therein at the predetermined place for the main transverse fold. Another function of said blade and groove is by their coaction to preserve the timing of bars 29'a'nd/1O andto assist them. to vibrate in unison.

a The slacking mechanism as herein described,

either with or without the creasing device, is

not restricted to use on tucked-paper tubing;

nor is such mechanism useful only on 'ma chines for making paper bags from tuckedpaper tubing; but such mechanism is equally elficacious on flat paper tubing and in'connec tion with machines for making the ordinary fiat paper bags. Furthermore, said slacking mechanism may be efliciently used on -unfolded paper strips and in connection with paper-handlingmachines other than paper-bag machines. a p

The means for operating side'clips 14 64: as to tucker-plate 13 are as follows: Said side clips and their appurtenances being right and left duplicates of one another, the description of one will suflice for both. Side clip 14: is fixed to one end of pinion-shaft 65 adjacent to one side of tucker-plate 13 and. which shaft is mounted foroscillation' with its axis preferably in the plane of the face of the tucker! plate. Said axis is also preferably parallel to the folding edge 69 of the side clip, and there fore atsubstantially forty-five degrees'to the axis of the tucker-plate; The bearing 66 for shaft 65 may be form'edfin an enlargement of axial shaft 12 and adjacent to one side of the.

tucker-plate. Slidably mounted in bearing 66 and preferably at substantially rightangles to shaft 65 is reciprocating rack-bar 7 0, provided with teeth'71, adapted and positioned forengagement with-the teeth of pinion 72, fixed on shaft 65. Said rack-barjs provided with a slotted head 7 3 and a pin 7 4: transverse of the tucker-plate.

a cam 91, similar to cam 81. arranged and adapted to engage with roll 100 on arm 99 'in the same manner that cam 81' engages with roll 80 on arm79, and bothof Isaid cams may be moved into operative posi' arm 86 engaging with cam 58. 91 and arms 86 96 may be returned to their idle positions by gravity. Said cams 81 91v .when in their operative positions, Figs. 4, 5, and 6, have the major part oftheir working the slot therein. In said slot is the free end of arm 75, which-arm is pivota-lly mounted on I stud 76 in bracket 77, aflixed to axial shaft 12 Said arm is provided with a" slot 78 for engagement with pin 74 of the rack-bar. On stud 76 is mounted another arm 79, on the free end of which is carried cam-roll 8O for engagement with cam 81. Arm 79 is ad justably fixed to arm 75 by means of clamp-screw 82, the projecting point 83 of which screw coacts with horn 8 1 on bracket- 7 7 to limit in one direction the stroke of arms 7 5 and 79. Said arms may be considered as one arm comprising two relatively adjustable members. Cam-roll 80 is urged toward its coacting cam 81 by means of spring 85,-one

end of which is attached to ear 860 as to arm 79 and the other end to bracket 87, projecting from bearing 66. On theopposite side of tucker-plate 13 side clip 64 is actuated by means comprising rack-bar 700," pinion 720, arm 790, &c., all respectively similar to themeans just enumerated in connection with side clip 14:. I 1

Cam 81 is adjustably secured to the free en of oscillatory arm 86, pivotally supported on shaft 87 in its adjacent side frame 3. Between its pivot and cam ends said arm-has mounted thereon a roll 88, adapted for engagement with cam 58. Said cam may be actuated and timed by means of gearing, as hereinbefore set forth.

Cam 81 may be secured to carrier 94: and adjusted circumferentially thereon by means of set-screws 90, passing through slots 89 in said cam and threaded into carrier 94:. Said carf rier 94:, by means of bolts 92, passing through slots 93 therein and threaded into arm 86, maybe adjusted inwardly and outwardly on said arm. Arm 86 is secured to one end of shaft :87, and'to the other end of said shaft, at the iot-her'side of the machine, is secured an oscil latory arm 96, similar-to arm 86 and carrying Said cam 91 is IIO tionsnFigs. 4: and 6, by means of roll 88 on Said cams 81 faces respectively concentric with axis 12 of the tucker-plate.

Mounted for oscillation on one side of car- As these arms .thereon cam-roll 104 for engagement with still earn 105. Said roll is constrained to such engagement by means of pull-spring 151, one end of which is attached to arm 102 and the other end to carrier 2. The free end of said arm is preferably provided with ears, as 113 114, between which is pivotally supported on haft 106 one or more guard blades or fingers 107. Said fingers may be aflixed to shaft 106 by some suitable meanssuch, for instance, as screws 108. On the end of shaft 106 extending toward the rearward side of the machine, Fig. 10, is affixed an arm 109 and mounted thereon a roll 110 for engagement with still cam 111. Roll 110 is urged toward earn 111 by means of spring 112, coiled about shaft 106, and to which shaft one end of said spring is attached. The other end of the spring is fast to ear 113 of arm 102.

The operation of my improved machine is as follows: Suitably-prepared tucked paper tubing T, preferably having slits, as 120, at proper intervals therein, having been fed under serrated knife 18 and around float 180 between feed-rolls 16 16, power is applied and the machine set in motion. By means of rolls 16 16 the tube is fed upwardly into engagement with rolls 19 20, revolving at the same surface speed as rolls 16 16, and said tube is held taut between the two pairs of rolls, respectively. Continuing the upward movement of the bag-tube between rolls 19 20, said rolls will presently revolve sufficiently to present groove 27 in roll 20 and groove 67 in roll 19 opposite one another, and thereby release their grip on the bag-tube; but slackerbars 29 69 in said grooves, respectively, are so positioned against the forward edges 36 46, respectively, of the grooves that before the bag-tube is released from the grip of the rolls it will have passed into the grip of the slacker-bars. At the same time ereaser-blade 59 in slacker-bar 29 engages the bag-tube and forces it into ereaser-groove in slacker-bar 40, thus forming a transverse crease in said bag-tube. Rolls 19 20 and striker 17 are so timed in their relation to each other that immediately following the delivery of the bagtube into the grip of the slacker-bars said striker moves into contact with the bag-tube just above the serrated edges of knife 18 and float 180. If the bag-tube was still in the grip of rolls 19 20, it would be immediately severed in its taut condition by the striker, which combination of circumstances would tend to more or less slue the bag-tube in the grip of said rolls and cause the severed bagblank to be diverted from its proper direction of movement toward the folding-bed, and thereby tend to vary the lateral position of said bag blank in its delivery onto the folding-bed. Furthermore, it is well known in the art of paper-bag machinery that any deviation from substantial uniformity in positioning the bag-blank on the folding-bed is conducive to malformation of the diamond fold, and therefore to the production of imperfect bags; but the bag-tube being held in the grip of slacker-bars 29 40 when pressure is applied tosaid tube by the striker, the slacker-bars by the backward pull on the bagtube will swing on their respective pivotshafts 30 48, and thereby form slack in said tube between the striker and the serrated edges of knife 18 and float 180, Fig. 12. The striker will continue to push the bag-tube transverse the edges of the knife and float until deterred by the slacker-bars contacting with the points of stop-screws 38 380, respectively. Said striker then se vers the bag-tn be, thus freeing the bag-blank from the continuous tube and allowing the slacker-bars, urged forward by their respective springs and still gripping the bag-blank, to swing upwardly on their respective pivot-shafts to their respective normal positions against walls 36 46 of their respective grooves in rolls 19 20. The slacker-bars and the bag-blanks are thus restored to their original timing with rolls 19 20. During the operation of the slacker-bars said rolls 19 20 have continued their uniform rotary movement and now grip the bag-blank between the rearward or bottom sides of their respective grooves and feed it upward onto folding-bed 4. Upon delivery of the bag-blank onto folding-bed 4 the forward end of said bag blank normally stands more or less open. Roll 10 on arm 8 of front clip 26 now passes into depression 11 of cam 11, and thereby permits spring 119 to rotate shaft 7 of front clip 26 in an anticlockwise direction and impels said clip toward the folding-bed. The lower ply of the forward end of the bag-blank is thereby gripped to the face of the forward end of the folding-bed, Fig. 4. At the same time by means of mechanism not shown (but fully set forth in the hereinbefore-mentioned patent to Claussen and Mortson) side clips 63 630 enter their respective side tucks of the bagblank and clamp the lower plies respectively thereof to the folding-bed. Also the forward movement of the bag-blank with the foldingbed causes the upper ply of the mouth of said blank to pass upwardly over hook 15 of tuckerplate 13. The continued rotation of the carrier 2 about its axial shaft 5 causes the upper ply of the mouth of the bag-blank to pass well up onto said hook 15, thereby further opening the mouth of the blank and affording room for the entrance therein of guard-lingers 107. During the delivery of the bag-blank onto the folding-bed and over hook 15 roll 104 on arm 102 has been ascending rise 105 on still cam 105, thereby retracting guard-fingers 107 from under the tuckerplate and from interference with the bagblank. Said roll now drops into depression 105 of said cam, thereby projecting said guard-fingers into the mouth of the bagand 13.

. sideclip mechanisms.

13 of the tucker-plate.

blank; the operative ends of said fingers" being held free of the bag-blank by the engagement of roll 110 on arm 109 with high part of cam 111. Roll 110 on arm 109 now'passes' onto the depressed portion 111* ofthe periphery of cam 111, thereby permitting spring 112 to urge guard-fingers 107 toward the lower ply of the bag-blank on folding-bed 4. The blank is therebygripped to the fold ing bed rearwardly' the front clip' 26 and about opposite to the inner ends of slits 120 in the lower ply of the bag-mouth, Figs. 8 The continued rotation of carrier 2 moves roll 10 onto high part 11 of camv 11, and therebyilifts front clip 26 from contact with the.bagblan-k, Fig. 9. During this time cam 58 has by means of the gearing provided therefor been rotated, so as to present its major radius to roll 88 on arm 86, andcams 81 and 91 are thereby moved up into operative position, Figs. 4, 5, and 6,witb the respective rolls 80 and 800 of the tucker-plate These mechanisms operate in unison and in asimilar manner to each other: The description of the operation of one will therefore sufiice for both. Cam

81 in moving from its idle position,-.-Fig. 1,

to its operative position, Fig. 4, presents the upper part 810 of its" face to roll 80 and pushes said roll ahead of it, and thereby rotates rock-arm 75 79 on its axis 76 and slides reciprocating rock-bar-70 downwardly in its bearing and by means of its teeth 71 in engagement with the teeth of pinion 72 on shaft parts of cams-81 91, respectively, which in their operative position are concentric with axis 12 of the tucker-plate, thereby holding side clips 1464 closed. Also the defining edge of said tucker-plate contacts and coincides with the transverse crease in the bag-blank previously formed by blade 69 and groove 60 in slacker-bars 29 40,- respectively, and presses thebag-blank to folding-bed 4, Fig. 9. At the same time said folding-bed, by means of spring 148, as allowed by the depression in cam 150, is swung inwardly toward'the axis 5 ofcarrier 2 in coaction with defining edge By means of side clips 14 64 and front hook the mouth of the bag-blank is opened preparatory to the foldingof the diamond. During the earlier stages of this opening out the bag-blank is peculiarly liable to betorn at thebase of slits 120. This tendency to tear is particularly active when the forward end of the lower ply of the bag-blank is held down by front clip 26; but in my improved machine said front clip is removed from engagement with the bag-blank, at this time said blank being temporari-ly held-by means of guard-fingers 107, as already described, and the/end of said blank is therefore free to rise from. the folding-bed, and thus relieve the strain at the base of slits 120. The tucker-plate continues its rotation and as the formation of the diamond nears completion roll 10 passes into depression 11 of cam 11, and front clip 26 again grips the bag-blank. At the same time roll 104 on fingers 107 are withdrawn from the bag-blank, and the engagement ofjroll110 with high part5 sentsits low .part 58' to-, -roll '88 on arm'86.

Cams 81,91 thereupon withdraw from engage;

ment with rolls 80 100, respectively. Side clips 14 64 are thereupon lifted from contact I withthebag-blank, which blank is then free, to continue its travel on folding-bed 4 of car- I rier 2. Said carrier continuing its revolution about its-axis 5f; the'diamond-folded bag-blank is delivered to suitable creasing, pasting, and

folding mechanism (not-shown) for th'e'com- 1. Thefcojmbmation of a pair of rolls, 19, 20,

a slacker-bar'in each of said rolls, and means for supporting each slacker-bar to yield in the line of its travel, all combined and operating substantially as described.

2. The combination of apair of rolls 19, 20, a slacker-bar in each of said rolls, means'for supporting each slacker-bar to yield in the line of its travel, and means for adjusting the strokes respectively of the slackerbars, all combined and operating substantially as described.

3. The combination of a pair of rolls 19, 20, a slacker-bar in each of said rolls, means for supporting each slacker-bar to yield in the line-of .its travel, and a creaser-blade 59 in one of the slacker-bars and a creaser-groove 60 in the other slacker-bar, all combined and operating substantially as described.

4. The combination of a pair of primary rolls 16, 16, knife 18, striker 17, a pair of secondary rolls 19, 20, a slacker-bar in each of said secondary rolls and means for supporting each slacker-bar to yield in the line of its travel, all combined and operating substantially as described. Y

5. The combination of a pair of rolls 19, 20, a slacker-bar in each of said rolls, arms 28 pivoted at each end of each roll respectively for supporting each slacker-bar to yield in a line substantially coincident with the periphery of its-respective roll, all combined and operating substantially as described.

6. The combination of a folding-bed, means to grip a bag-blank thereto, a tucker-plate 7s arm 102 rides up incline. 1059011 cam 1'05 and mounted for vibration above the folding-bed and for coaction therewith, a side clip pivotall y mounted on each side of the tucker-plate,

a pinion on each side-clip pivot-shaft, a rackbar in engagement with each pinion, a rockarm for actuating each rack-bar and a cam for actuating each rock-arm, all combinedand operating substantially as described.

7. The combination of a folding bed, means to grip a bag-blank thereto, a tucker-plate mounted for vibration above the folding-bed and for eoaction therewith. a side clip pivotally mounted on each side of the tucker-plate, a pinion on each side-clip pivot-shaft, a rackbar in engagement with each pinion, .a cam for actuating each raclebar and means intermediate each rack-bar and cam respectively for actuating the rack-bar from the cam, all combined and operating substantially as .described.

8. In a paper-bag machine, the combination of a tucker-plate vibrating upon fixed trunnions, oppositely-disposed side clips pivotally mounted on the tucker-plate, a pinion on each side-clip pivot-shaft, a rack-bar in engagement with each pinion, two oppositelydisposed equal earns, a rock-arm intermediate each rack-bar and cam respectively, for actuating the rack-bar from the cam, and means to move the cams into and out of engagement with the rock-arms respectively, all combined and operating substantially as described.

9. The combination of a folding-bed, oppositely-disposed side clips and a front eli p thereon, means above the folding-bed for opening out the forward end of a bag-blank and folding it down into the diamond form, a guardfinger mounted for movement into the mouth of the bag-blank and onto the lower ply thereof. and means to actuate the guard-linger, all combined and operating substantially as described.

10. The combination of a rotatable carrier, at folding-bed thereon, oppositelydisposed side clips and a front clip on the folding-bed, means above the folding-bed for opening out the forward end of a bag-blank and folding it down into the diamond form, an oscillatable arm pivotally mounted in the rotatable carrier, a guard-finger pivotally mounted in the free end of the oseillatable arm, means to oscillate the arm toward and away from the folding-bed and means to move the guardfinger up and down with respect of the folding-bed.

In testimony whereof I have signed my name to this specification, in the presence of two subscribing witnesses, this 23d day of February, 1904.

FREDERICK E. S'ITRASBURG.

Witnesses THEO. HAwLnY, HAROLD SMITIIWICK. 

